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Third Lumbrical Muscle of Foot
Muscular System

Third Lumbrical Muscle of Foot

Musculus lumbricalis pedis tertius

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Quick Facts

Origin: Tendons of flexor digitorum longus that travel to the third and fourth toes.

Insertion: Medial aspect of extensor expansion of fourth toe.

Action: Simultaneously flexes metatarsophalangeal joint and extends interphalangeal joints of fourth toe.

Innervation: Deep branch of lateral plantar nerve (S2-S3).

Arterial Supply: Lateral plantar artery, deep plantar arch, and plantar metatarsal arteries.

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Origin

The third lumbrical muscle of foot consists of two heads:

- the medial head, which originates from the lateral aspect of the tendon of flexor digitorum longus that travels to the third toe;

- the lateral head, which originates from the medial aspect of the tendon of flexor digitorum longus that travels to the fourth toe.

Insertion

The fibers of the third lumbrical muscle of foot travel anteriorly to the fourth toe and insert, via a short tendon, onto the medial aspect of the extensor expansion of the fourth toe.

Key Features & Anatomical Relations

The third lumbrical muscle of foot is located in the second layer of muscles that are found in the plantar part of the foot. It is a short, wormlike, bipennate skeletal muscle.

It is located:

- superficial (inferior) to the adductor hallucis muscle and the second plantar interosseous muscle of foot;

- deep (superior) to the plantar aponeurosis;

- medial to the tendon of flexor digitorum longus that travels to the fourth toe;

- lateral to the tendon of flexor digitorum longus that travels to the third toe.

Actions

The third lumbrical muscle of foot simultaneously flexes the fourth metatarsophalangeal joint and extends the interphalangeal joints of the fourth toe (Moore, Dalley and Agur, 2009).

List of Clinical Correlates

- Clawing of the toes

- Charcot-Marie-Tooth disease

References

Moore, K. L., Dalley, A. F. and Agur, A. M. R. (2009) Clinically Oriented Anatomy. Lippincott Williams & Wilkins.

Actions

The third lumbrical muscle of foot simultaneously flexes the fourth metatarsophalangeal joint and extends the interphalangeal joints of the fourth toe (Moore, Dalley and Agur, 2009).

Learn more about this topic from other Elsevier products

Foot Muscle

ScienceDirect image

In fact, atrophy of foot muscles is even observed in patients without clinical signs of DSPN, underlining the presence of motor changes in DSPN well in advance of clinical findings and complaints [85].

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Complete Anatomy